EP2068571A1 - Appareil de communication sans fil - Google Patents

Appareil de communication sans fil Download PDF

Info

Publication number
EP2068571A1
EP2068571A1 EP06810772A EP06810772A EP2068571A1 EP 2068571 A1 EP2068571 A1 EP 2068571A1 EP 06810772 A EP06810772 A EP 06810772A EP 06810772 A EP06810772 A EP 06810772A EP 2068571 A1 EP2068571 A1 EP 2068571A1
Authority
EP
European Patent Office
Prior art keywords
handover
signal
base station
random access
synchronization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06810772A
Other languages
German (de)
English (en)
Other versions
EP2068571B1 (fr
EP2068571A4 (fr
Inventor
Yoshihiro Kawasaki
Tsuyoshi Shimomura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to EP13192445.8A priority Critical patent/EP2704496B1/fr
Priority to EP13153169.1A priority patent/EP2592883B1/fr
Publication of EP2068571A1 publication Critical patent/EP2068571A1/fr
Publication of EP2068571A4 publication Critical patent/EP2068571A4/fr
Application granted granted Critical
Publication of EP2068571B1 publication Critical patent/EP2068571B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Definitions

  • the present invention relates to a wireless communication device for transmitting a random access signal when a mobile terminal synchronizes itself with a base station.
  • EUTRAN EUTRAN
  • EUTRAN EUTRAN
  • 3GPP Third Generation Partnership Project
  • a handover performed between different cells respectively covered by different base stations in response to the moving of a mobile terminal station is handled as a hard handover.
  • a line that connects a mobile terminal and a base station before the moving of the mobile terminal is disconnected, and thereafter a line between the mobile terminal and another base station covering the movement destination is connected.
  • a handover can be performed in a short period even when that handover is a hard handover by obtaining system information on the base station covering the movement destination immediately before performing the handover, the transmission of user data is interrupted during the handover.
  • a CAZAC Constant Amplitude Zero Auto Correlation
  • the preamble portion of a data frame contains a random access signal transmitted in an uplink line.
  • a Zadoff-Chu sequence, a GCL sequence, etc. can be used as a CAZAC sequence.
  • An expression expressing a Zadoff-Chu sequence is given below, where L represents a sequence length, and k represents a sequence index. Particularly when the length 1 is a prime number, an excellent autocorrelation characteristic and a cross-correlation characteristic are obtained.
  • c k n exp j ⁇ 2 ⁇ ⁇ ⁇ k L ⁇ n + n ⁇ n + 1 2 if L is odd
  • c k n exp j ⁇ 2 ⁇ ⁇ ⁇ k L ⁇ n + n 2 2 if L is even
  • Fig. 1 is a block diagram illustrating an example of a circuit generating, from a CAZAC sequence, a preamble portion of a random access signal used in a wireless uplink according to the EUTRAN.
  • a CAZAC sequence with a length of M(L) is subject to a serial/parallel conversion, and is input into a DFT unit 10, and thereafter is Fourier-transformed into a parallel signal with parallel number M.
  • This signal is input into a subcarrier mapping unit 11, and is mapped into N subcarriers.
  • the subcarrier signals obtained by mapping the CAZAC sequence are input into an IFFT unit 12, and are subject to an inverse Fourier transform, and thereafter are input into a parallel/serial conversion unit 13.
  • a signal with parallel number N output from the IFFT unit 12 is converted into a serial signal by the parallel/serial conversion unit 13, and is output as a random access preamble sequence.
  • the maximum system bandwidth (a sending/receiving bandwidth used in a wireless transmission line by base stations) for transmission and reception in the radio section is 20MHz, and the transmission/reception minimum bandwidth for terminal stations is currently set to be 10MHz.
  • terminal stations are capable of transmitting and receiving signals having a bandwidth of at least 10MHz.
  • cells can be arranged in such a manner that base stations having different system bandwidths are adjacent to each other.
  • synchronization channels and broadcast signal channels are arranged around the middle of the downlink transmission bandwidth.
  • synchronization channels can be arranged at two or three portions in a transmission bandwidth when the system transmission bandwidth is 20MHz. This is based on the consideration of the existence of a mobile terminal station transmitting and receiving signals having a bandwidth of 10MHz.
  • synchronization channels are not always inserted into all subframes, and a synchronization channel is set to be inserted into every 5, 10 or 20 subframes to be transmitted.
  • a handover between adjacent cells covered by different base stations is handled as a hard handover, and in a hard handover, when a mobile terminal station starts a handover while it is transmitting data, a downlink transmission being performed targeting that mobile terminal station is interrupted, and the downlink data is transferred to the base station in the handover destination from the base station that has been communicating with that mobile terminal device.
  • a buffer in a base station has to accumulate the downlink data for the mobile terminal device until the handover is completed, and as a period required for performing a handover becomes longer, the amount of data that is accumulated in a buffer increases as well.
  • uplink data to be transmitted from the mobile terminal station to the base station has to be prevented from being transmitted when a handover has started, and has to be accumulated in a buffer in a mobile terminal station. In such a case, some data may be discarded in a process of the handover, which requires retransmission using a higher-level layer in the case of normal data.
  • the order of sequence numbers assigned to the successive pieces of data may be changed.
  • the downlink speech packets are transferred to the base station in the handover destination; however, it is impossible to avoid an interruption.
  • audio communication is real time communication, and accordingly all speech packets transferred are not always utilized effectively in the transfer destination.
  • a terminal station In a process of a handover, a terminal station has to capture a downlink synchronization channel transmitted from the base station in the handover destination, has to synchronize itself with the base station, and has to transmit a random access signal in an uplink channel. If a random access signal can be transmitted immediately after the completion of the downlink synchronization, time consumed by a handover can be reduced.
  • the values of the PAPR (peak-to-average power ratio) of the preamble portions vary depending upon the values of the index k even when the length 1 of the CAZAC sequences used does not vary.
  • Fig. 2 depicts a PAPR characteristic of a preamble signal having a bandwidth of 5MHz and using a Zadoff-Chu sequence.
  • the sequence length of the Zadoff-Chu sequence used in the illustration of Fig. 2 is fixed; however, the index k is changed to various values in order to check the values of the PAPR.
  • This graph illustrates that differences equal to or greater than 3dB can be caused in the values of the PAPR depending on the values of the index. The higher the PAPR a sequence has, the greater the peak power in comparison with the average power.
  • the back-off amount of the transmitting power of the transmission unit power amplifier of the mobile terminal station has to increase as the PAPR of the CAZAC sequence used as the preamble increases.
  • the amplifier consumes more power.
  • a transmission unit power amplifier presents a linear amplification characteristic with a smaller input power, whereas this amplification characteristic becomes non-linear with an input power around and greater than a certain input power value that is determined by the amplifier itself, and thereby the amplification ratio is saturated and decreases.
  • Non-patent document 1 discloses specifications for the EUTRAN.
  • Non-patent document 2 includes a description about CAZAC sequences such as a Zadoff-Chu sequence, etc.
  • a mobile terminal station When a handover is performed, a mobile terminal station is near the edge of a cell, and accordingly a transmission power required to generate a preamble signal transmitted from such a mobile terminal station so that it can be successfully received by the reception unit of the base station is greater than that required to generate the same preamble signal transmitted from another mobile terminal station near the base station. Also, a transmission power required to transmit a preamble portion of a random access signal from a mobile terminal station near the edge of a cell having a large radius can sometimes be greater than the maximum transmission power of the mobile terminal station.
  • a terminal station when a handover is performed, a terminal station has to capture a downlink synchronization channel transmitted from the base station in the handover destination, has to synchronize itself with the base station, and has to transmit a random access signal in an uplink channel. If a random access signal can be transmitted immediately after the success in the downlink synchronization, the time consumed by a handover can be reduced.
  • the present invention uses a wireless communication device dividing uplink and downlink frequency bandwidths into narrower frequency bandwidths, assigns data to the narrower frequency bandwidths, and performs wireless communication
  • the wireless communication device comprising: synchronization signal capturing unit for capturing, when receiving a notice requiring a handover to be performed, a synchronization signal transmitted from a base station in a handover destination; and synchronization establishment signal transmission unit for transmitting a synchronization establishment signal for establishing synchronization with a base station in the handover destination, by using a frequency position in an uplink frequency bandwidth at a time point later than a timing of capturing the synchronization signal by a prescribed period.
  • a frequency position for transmitting a synchronization signal in a downlink frequency bandwidth is the same as a frequency position for transmitting a synchronization establishment signal in an uplink frequency bandwidth.
  • a frequency position for transmitting a synchronization signal in a downlink frequency bandwidth corresponds to the center frequency
  • a synchronization establishment signal is transmitted at the central frequency position in an uplink frequency bandwidth. It is an object of the present invention to suppress an increase in the backing off of transmission power caused by a signal (such as a preamble portion of a random access signal) transmitted from a place distant from a radio base station.
  • the present invention uses a mobile station establishing an uplink wireless connection by transmitting a random access signal through a random access channel after receiving a synchronization channel transmitted from a radio base station in a handover destination, comprising: a preamble generating unit for restricting a CAZAC sequence used as a preamble of the random access signal to a prescribed CAZAC sequence from among a plurality of CAZAC sequences with different indexes, and generating the preamble of the random access signal using the prescribed CAZAC sequence.
  • Fig. 3 illustrates the first principle of an embodiment of the present invention.
  • Fig. 3 illustrates arrangements of the downlink and uplink signals in the frequency and time directions, with the horizontal axis representing the frequencies and the vertical axis representing the time.
  • a synchronization channel is set around the center frequency of the system bandwidth among subframes transmitted in the downlink.
  • a synchronization channel is not contained in all subframes transmitted in the downlink, but is contained in, for example, every five or ten subframes to be transmitted.
  • a random access signal when a synchronization channel is detected in a downlink signal, a random access signal is contained (accommodated) in an uplink subframe corresponding to the time point subsequent to that time by the time offset Toffset, and the signal is transmitted to a base station from a mobile terminal.
  • the frequency used for accumulating the random access signal is near the center frequency in the system bandwidth of the uplink because a downlink synchronization channel is near the center frequency of the system bandwidth.
  • a slot shaded with diagonal lines is used for transmitting a random access signal.
  • a random access signal to be transmitted can be inserted into plural successive subframes; however, only an uplink subframe corresponding to a Lime point subsequent to the synchronization channel by the time offset Toffset can be used as the subframe for starting the transmission of the random access signal regardless of the length of the random access signal. If the transmission of a random access signal fails (when a response signal is not transmitted from the base station), the random access signal is inserted into the same position (uplink subframes subsequent to the timing of another synchronization channel to be transmitted subsequently by the time offset Toffset), and is retransmitted. As a matter of course, when plural opportunities to transmit a random access signal have been given to a single synchronization channel, the random access signal can be transmitted at the next transmission opportunity.
  • Fig. 4 illustrates the second principle of an embodiment of the present invention.
  • uplink and downlink signals are illustrated with the horizontal axis representing the frequencies and the vertical axis representing the time.
  • a configuration is employed in a case in which the system bandwidth is wide and the receiving band of a receiving mobile terminal station is only half the system bandwidth.
  • a downlink signal has synchronization channels set around two frequencies in a single subframe (however, synchronization channels may be set at three or more positions).
  • a frequency used for transmitting a random access signal of a terminal station for which a handover is being performed is a frequency in the frequency band of the uplink signal, said frequency corresponding to the frequency at which synchronization channels are set in the system bandwidth of the uplink signal.
  • synchronization channels are near the center portions respectively of two bands obtained by dividing the frequency band of the downlink
  • random access signals as well are near the center portions respectively of two bands obtained by dividing the frequency band of the uplink.
  • the timing of starting a transmission of a random access signal is in a subframe of an uplink signal corresponding to a time point subsequent to the time point of the detection of a synchronization signal in a downlink signal by the time offset Toffset.
  • portions shaded with diagonal lines are slots in which the transmission of random access signals starts. Because there are synchronization channels in two slots in a downlink signal, there are also two slots that can be used for transmitting a random access signal in an uplink signal.
  • a random access signal to be transmitted can be inserted into plural successive subframes; however, only an uplink subframe corresponding to a time point subsequent to the synchronization channel by the time offset Toffset can be used as the subframe for starting the transmission of the random access signal regardless of the length of the random access signal.
  • the random access signal is inserted into the same position (uplink subframes subsequent to the timing of another downlink synchronization channel to be transmitted subsequently by the time offset Toffset) to be retransmitted.
  • Figs. 5 through 7 illustrate sequences for performing a handover according to an embodiment of the present invention.
  • Fig. 5 illustrates the first example.
  • a (mobile) terminal station transmits to the movement destination base station a result of measuring a received power of a signal (a pilot signal or the like) transmitted from a neighboring cell, and the movement origin base station determines that it should perform a handover (1). Then, the movement origin base station transmits information confirming that a handover is going to be performed, information on the mobile terminal station, and the like.
  • a signal a pilot signal or the like
  • the movement destination base station sets a timing and frequency to be used for transmitting a random access signal exclusively for the mobile terminal station for which the handover is going to be performed in such a manner that the set timing and frequency are not assigned to an uplink data transmission by another mobile terminal station for which a handover is not going to be performed (2).
  • the above timing is a timing subsequent to the reception of the synchronization signal by the terminal station by the time offset
  • the above frequency is a frequency in the uplink corresponding to the frequency used for transmitting a downlink synchronization channel.
  • the timing and frequency for transmitting a random access signal of a terminal station for which a handover is being performed can be assigned to a terminal station for which a handover is not going to be performed.
  • system information including the sequence index of the CAZAC sequence of the random access signal used for the handover is transmitted to the movement source base station. At that time, a CAZAC sequence with a small PAPR is selected to be transmitted.
  • indexes with small PAPRs are, for example, indexes other than indexes with PAPRs of 6dB or higher in Fig. 2 .
  • indexes can be selected from the ranges of between 1 and 75, 132 and 168, and 225 and 298 as indexes with relatively small PAPRs. When these ranges are expressed using the sequence length L, indexes can be selected from ranges of between 1 and L/3, L/2-L/16 and L/2+L/16, and 2L/3 and L-1.
  • the setting of (2) can be performed after the transmission of the system information, etc. to the movement origin base station.
  • the movement origin base station that received the system information, etc. transmits to the mobile terminal station for which a handover is being performed system information on the movement destination cell including the sequence index of the CAZAC sequence used for the handover in order to instruct the mobile terminal station to start the handover. Thereafter, while still having data to transmit to the terminal station, the movement origin base station transfers that data to the movement destination base station. However, such data may also be transferred after the handover has succeeded.
  • the terminal station Having received an instruction to start the handover, the terminal station starts synchronizing itself with the movement destination cell.
  • the terminal station captures a downlink synchronization channel from the movement destination base station (4), and transmits a preamble portion of a random access signal (synchronization establishment signal) to the movement destination base station.
  • Control information or the like may be included in the preamble portion in a multiplexing manner (code multiplexing, time multiplexing, etc.).
  • For a transmission of the preamble portion of the random access signal timing and frequency for the transmission of a random access signal exclusively for a terminal station for which a handover is being performed are used.
  • the terminal station When the movement destination base station has received the preamble portion of the random access signal and succeeded in properly recognizing the sequence in the preamble portion, a preamble portion reception confirmation and the timing and frequency for transmitting uplink data are reported to the terminal station. Having received this information, the terminal station transmits a handover completion report signal to the movement destination base station. The movement destination base station, having received this signal, transmits the handover completion report signal to the movement origin base station after a process necessary for establishing a wireless link with the terminal station is completed.
  • the movement destination base station restarts releasing the timing and frequency for a transmission of a random access signal exclusively for a terminal station for which a handover is being performed so that they can be used for transmitting uplink data for terminals for which a handover is not being performed (5).
  • the period between (2) and (5) in Fig. 5 is a period during which a timing and frequency for transmission of a random access signal of a terminal station for which a handover is being performed are exclusively assigned to the terminal station for which a handover is being performed.
  • a timing and frequency for transmission of a random access signal of a terminal station for which a handover is being performed are assigned to a terminal station for which a handover is not being performed when there is not a terminal station for which a handover is being performed.
  • Fig. 6 illustrates the second example.
  • a (mobile) terminal station transmits to the movement origin base station a result of measuring a received power or the like of a signal (pilot signal or the like) from a neighboring cell, and the movement destination base station determines that a handover is to be performed (1). Thereafter, the movement origin base station transmits information confirming that a handover is going to be performed, information on the mobile terminal station, and the like to the movement destination base station.
  • the movement destination base station sets a timing and frequency to be used for transmitting a random access signal exclusively for the mobile terminal station for which the handover is going to be performed in such a manner that the set timing and frequency are not assigned to uplink data transmission by another mobile terminal station for which a handover is not going to be performed (2).
  • the above timing is a timing subsequent to the reception of the synchronization signal by the terminal station by the amount of time in the time offset
  • the above frequency is a frequency in the uplink corresponding to the frequency used for transmitting a downlink synchronization channel.
  • the timing and frequency for transmitting a random access signal of a terminal station for which a handover is being performed can be assigned to a terminal station for which a handover is not going to be performed.
  • system information including the sequence index of the CAZAC sequence of the random access signal used for the handover is transmitted to the movement source base station.
  • the setting of (2) may be performed after the transmission of the system information, etc. to the movement origin base station.
  • the movement origin base station transmits the system information on the movement destination cell to the mobile terminal station, and instructs the mobile terminal station to start the handover. Thereafter, when the movement origin base station still has data to transmit to the terminal station, it transfers that data to the movement destination base station. However, such data may also be transferred after the handover has succeeded.
  • the terminal station Having received an instruction to start the handover, the terminal station starts synchronizing itself with the movement destination cell (3).
  • the terminal station captures a downlink synchronization channel transmitted from the movement destination base station (4), and transmits a preamble portion of a random access signal to the movement destination base station.
  • Control information or the like may be included in the preamble portion in a multiplexing manner (code multiplexing, time multiplexing, etc.).
  • the timing and frequency for the transmission of a random access signal exclusively for a terminal station for which a handover is being performed are used.
  • the movement destination base station When the movement destination base station has received the preamble portion of the random access signal and has succeeded in properly recognizing the sequence of the preamble portion, a preamble portion reception confirmation and timing and frequency for transmitting uplink data are reported to the terminal station. Having received this information, the terminal station transmits a handover completion report signal to the movement destination base station. The movement destination base station, having received this signal, transmits the handover completion report signal to the movement origin base station after a process necessary for establishing a wireless link with the terminal station is completed. Thereafter, the movement destination base station restarts assigning timing and frequency for transmission of a random access signal exclusively for a terminal station for which a handover is being performed as timing and frequency for transmitting uplink data for terminals for which a handover is not being performed.
  • the period between (2) and (5) in Fig. 6 is a period during which the timing and frequency for the transmission of a random access signal of a terminal station for which a handover is being performed are exclusively assigned to a terminal station for which a handover is being performed.
  • the timing and frequency for the transmission of a random access signal of a terminal station for which a handover is being performed are assigned to a terminal station for which a handover is not being performed when there is not a terminal station for which a handover is being performed.
  • Fig. 7 illustrates the third example.
  • a (mobile) terminal station transmits to the movement origin base station a result of measuring a received power or the like of a signal (pilot signal or the like) from a neighboring cell, and the movement destination base station determines that a handover is to be performed (1). Thereafter, the movement origin base station transmits information confirming that a handover is going to be performed, information on the mobile terminal station, and the like.
  • timing and frequency are set beforehand to be exclusively for the transmission of a random access signal for a mobile terminal station for which a handover is being performed in order to prevent the timing and frequency from being used for other purposes.
  • the above timing is a timing subsequent to the reception of the synchronization signal by the terminal station by the amount of time in the time offset
  • the above frequency is a frequency in the uplink corresponding to the frequency used for transmitting a downlink synchronization channel.
  • the movement destination base station transmits to the movement origin base station the system information, including the sequence index of the CAZAC sequence for the random access signal used for the handover.
  • the movement origin base station transmits the system information on the movement destination base station to the mobile terminal station, and instructs the mobile terminal station to start the handover. Thereafter, the movement origin base station has data yet to be transmitted to the terminal station, it transfers that data to the movement destination base station. However, such data may also be transferred after the handover has succeeded.
  • the terminal station Having received an instruction to start the handover, the terminal station starts synchronizing itself with the movement destination cell (2).
  • the terminal station captures a downlink synchronization channel from the movement destination base station (3), and transmits a preamble portion of a random access signal to the movement destination base station.
  • the timing and frequency for the transmission of a random access signal exclusively for a terminal station for which a handover is being performed are used.
  • the terminal station transmits a handover completion report signal to the movement origin base station after a process necessary for establishing a wireless link with the terminal station.
  • Fig. 8 is a block diagram illustrating a mobile terminal station according to an embodiment of the present invention.
  • a radio unit 10 demodulates the signal and a decoding unit 11 decodes the signal in order to obtain user data/speech packets, a control signal, sequence information used for a handover, and a handover instructing signal.
  • Outputs from the DFT unit 10 are input into a downlink synchronization channel receiving process unit 13. Thereafter, a process of receiving a synchronization channel is performed, and a reception result is input into a handover operation control unit 14.
  • the handover operation control unit 14 controls a receiving frequency control unit 12, a sequence determination unit 15, and a random-access-signal transmission-timing-and-frequency determination unit 19.
  • the reception frequency control unit 12 controls frequency used when receiving a synchronization channel.
  • the sequence determination unit 15 determines a sequence to be used for a random access signal.
  • a sequence used for a random access signal may be reported from the radio base station in the handover origin.
  • the random-access-signal transmission-timing-and-frequency determination unit 19 determines a timing and frequency for a random access signal.
  • a transmission frequency control unit 20 controls a radio unit 28 and a modulation unit 27 in order to transmit a random access signal at the timing and frequency determined in the present invention.
  • the determined sequence is generated by a preamble-signal sequence generating unit 16, and a random access preamble signal generating unit 17 uses this sequence in order to generate a preamble signal containing a random access signal.
  • This preamble signal is combined with control information in a multiplexing manner by a multiplexing unit 18, and the resultant information is input into a switching unit 26.
  • a speech packet, user data, and a result of measuring a neighboring cell are input into a multiplexing/switching unit 21, are output in a combined (multiplexed) state or in a one-by-one manner, and are coded by a channel coding unit 22.
  • a control signal as well is coded by another channel coding unit 23.
  • Outputs from the channel coding units 22 and 23 are output by another multiplexing/switching unit 24 in a combined (multiplexed) state or in a one-by-one manner, are mapped onto a physical channel by a physical channel generating unit 25, and are input into the switching unit 26.
  • the switching unit 26 switches between signals from the multiplexing unit 18 and signals from the physical channel generating unit 25 to output to the transmitting antenna via the modulation unit 27 and the radio unit 28.
  • Fig. 9 is a block diagram illustrating a configuration of a movement origin base station when a handover is being performed according to an embodiment of the present invention.
  • a signal received by a receiving antenna is demodulated by a radio unit 30, and is decoded by a decoding unit 31.
  • a result of measuring a neighboring cell is obtained from the decoded signal and is used for a handover determination unit 32 to determine whether or not a handover is to be performed for the terminal station that has sent that result.
  • information confirming the performing of the handover and information on the terminal station for which the handover is going to be performed are transmitted to the movement destination base station.
  • a handover operation processing unit 33 Having received system information on the movement destination base station and random access signal preamble sequence information used for the handover (for example, information on the sequence length L and the index k for recognizing a sequence with a PAPR, or the like) transmitted from the movement origin base station, a handover operation processing unit 33 generates random access signal preamble sequence information used for the handover and a handover starting instruction signal, and system information on the movement destination base station.
  • a physical channel generating unit 34 maps the generated information onto a physical channel. The resultant information is transmitted through the transmitting antenna after going through a modulation unit 35 and a radio unit 36.
  • Fig. 10 is a block diagram representing a configuration of a movement destination base station when a handover is being performed according to an embodiment of the present invention.
  • handover confirmation information and handover target terminal information are received from the movement origin base station of a terminal station for which a handover is being performed. Thereafter, a handover operation processing unit 42 transmits to the movement origin base station random access signal preamble sequence information used for the handover and the system information on the base station. Further, the handover operation processing unit 42 requests that an uplink radio resource management unit 47 prohibit other stations from using the timing and frequency for the random access signal of the terminal station for which the handover is going to be performed and that it assign an uplink radio resource to be used until the handover tor the terminal station is completed.
  • the uplink radio resource management unit 47 transmits information on the assignment of an uplink radio resource to the mobile terminal station via a physical channel generating unit 48, a modulation unit 49, and a radio unit 50.
  • a received random access signal detection processing unit 43 attempts to detect reception of a random access signal that may have been received in order to determine whether or not a random access signal was transmitted.
  • the process of detecting the preamble portion of a random access signal is performed by the received random access signal detection processing unit 43 under control of the handover operation processing unit 42 and a received preamble confirmation unit 44.
  • the received preamble confirmation unit 44 transmits reception confirmation information on the preamble portion to the terminal station via the physical channel generating unit 48, the modulation unit 49, and the radio unit 50.
  • a random access signal receiving timing detection unit 45 detects the timing at which the random access signal was received, and calculates a gap in the transmission timing from the terminal station, generates an uplink transmission timing correction information signal, and transmits this signal to the terminal station via the physical channel generating unit 48, the modulation unit 49, and the radio unit 50.
  • a handover completion determination unit 46 determines that the handover has been completed, and transmits a request to the uplink radio resource management unit 47 to release the timing and frequency for the random access signal for the terminal station for which the handover has been performed.
  • a handover completion report is transmitted to the movement origin base station.
  • the synchronization channel transmitted from the movement destination base station when a handover is performed is transmitted via the physical channel generating unit 48, the modulation unit 49, the radio unit 50, and the transmitting antenna.
EP06810772.1A 2006-09-28 2006-09-28 Appareil de communication sans fil Active EP2068571B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13192445.8A EP2704496B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil
EP13153169.1A EP2592883B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/319325 WO2008038367A1 (fr) 2006-09-28 2006-09-28 Appareil de communication sans fil

Related Child Applications (4)

Application Number Title Priority Date Filing Date
EP13153169.1A Division-Into EP2592883B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil
EP13153169.1A Division EP2592883B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil
EP13192445.8A Division EP2704496B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil
EP13192445.8A Division-Into EP2704496B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil

Publications (3)

Publication Number Publication Date
EP2068571A1 true EP2068571A1 (fr) 2009-06-10
EP2068571A4 EP2068571A4 (fr) 2012-07-04
EP2068571B1 EP2068571B1 (fr) 2014-02-12

Family

ID=39229815

Family Applications (3)

Application Number Title Priority Date Filing Date
EP13192445.8A Active EP2704496B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil
EP06810772.1A Active EP2068571B1 (fr) 2006-09-28 2006-09-28 Appareil de communication sans fil
EP13153169.1A Active EP2592883B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP13192445.8A Active EP2704496B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP13153169.1A Active EP2592883B1 (fr) 2006-09-28 2006-09-28 Dispositif de communication sans fil

Country Status (9)

Country Link
US (2) US8194612B2 (fr)
EP (3) EP2704496B1 (fr)
JP (1) JP4801739B2 (fr)
KR (1) KR101036985B1 (fr)
CN (1) CN101513099B (fr)
AU (1) AU2006348829B8 (fr)
CA (2) CA2767302C (fr)
RU (4) RU2483491C2 (fr)
WO (1) WO2008038367A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2706796A3 (fr) * 2012-09-11 2016-11-16 Fujitsu Limited Terminal, circuit de communication and méthode de communication avec transmission d'un signal d'accès aléatoire en cas de perte de synchronisation.
EP3247156A4 (fr) * 2015-02-12 2018-02-21 Huawei Technologies Co., Ltd. Dispositif, système et procédé d'émission de signal

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008038367A1 (fr) * 2006-09-28 2008-04-03 Fujitsu Limited Appareil de communication sans fil
US8363608B2 (en) * 2006-09-29 2013-01-29 Panasonic Corporation Sequence allocating method and sequence allocating apparatus
CN101924598B (zh) 2006-09-30 2012-11-21 华为技术有限公司 通信系统中序列分配方法、序列处理方法及装置
KR100910707B1 (ko) * 2006-10-19 2009-08-04 엘지전자 주식회사 제어신호 전송 방법
DE602008004885C5 (de) 2007-03-07 2017-04-27 Huawei Technologies Co., Ltd. Sequenzverteilung, verarbeitungsverfahren sowie entsprechende vorrichtung in einem kommunikationssystem
KR101350441B1 (ko) * 2007-09-27 2014-01-23 삼성전자주식회사 무선 통신 시스템에서 상향링크 송신 타이밍 추정 방법 및장치
US8718694B2 (en) * 2007-12-07 2014-05-06 Interdigital Patent Holdings, Inc. Method and apparatus of signaling and procedure to support uplink power level determination
US9173197B2 (en) 2008-09-12 2015-10-27 Qualcomm Incorporated Method and apparatus for signaling to a mobile device which set of training sequence codes to use for a communication link
JP5145294B2 (ja) * 2008-09-22 2013-02-13 株式会社エヌ・ティ・ティ・ドコモ 移動端末装置、無線基地局装置及び移動通信システム
CN101883406B (zh) * 2009-05-07 2015-04-08 株式会社Ntt都科摩 一种切换方法、移动终端及基站
CN102083148B (zh) * 2009-11-27 2015-01-21 华为终端有限公司 微基站重配置方法及相应的微基站
WO2011082689A1 (fr) * 2010-01-08 2011-07-14 Mediatek Inc. Synchronisation de liaison montante à deux étapes pour des picocellules/ femtocellules
KR101803015B1 (ko) * 2010-02-10 2017-12-01 주식회사 골드피크이노베이션즈 다수의 요소 반송파를 운영하는 무선 통신 시스템에서 업링크 동기를 설정하는 방법 및 장치
CN102264110B (zh) * 2010-05-25 2015-08-12 中兴通讯股份有限公司 基于无线资源分配数据库的切换方法及系统
US8565342B2 (en) * 2010-06-22 2013-10-22 Sony Corporation Power amplification apparatus, OFDM modulation apparatus, wireless transmission apparatus, and distortion reduction method for power amplification apparatus
CN103190185B (zh) * 2010-09-21 2017-09-22 爱立信(中国)通信有限公司 空中接口定时同步共享
JP5556640B2 (ja) 2010-12-10 2014-07-23 アイコム株式会社 プリアンブル生成装置、プリアンブル生成方法、およびプログラム
EP2555567B1 (fr) * 2011-08-02 2014-03-26 Vodafone Holding GmbH Procédé d'utilisation réduite de ressources dans une synchronisation de système, fourniture de données et accès en temps réel asynchrone dans des systèmes de communication mobiles avec plusieurs terminaux à faible complexité
WO2013046375A1 (fr) 2011-09-28 2013-04-04 富士通株式会社 Procédé de transmission de signal sans fil, dispositif de transmission de signal sans fil, dispositif de réception de signal sans fil, dispositif formant station de base sans fil et dispositif formant terminal sans fil
KR20140075770A (ko) 2011-09-29 2014-06-19 노키아 솔루션스 앤드 네트웍스 오와이 방법 및 장치
CN103167624B (zh) * 2011-12-14 2015-09-30 电信科学技术研究院 一种认知无线电系统中的随机接入方法和设备
WO2014029092A1 (fr) * 2012-08-22 2014-02-27 华为技术有限公司 Procédé d'accès, équipement et station de base
EP2905906B1 (fr) * 2012-09-07 2018-12-12 Mitsubishi Electric Corporation Émetteur et procédé d'émission
US10334630B2 (en) * 2012-12-10 2019-06-25 Fujitsu Connected Technologies Limited System and method for user-over-control plane messaging in a wireless network
EP3198973B1 (fr) * 2014-09-24 2019-06-05 Nokia Solutions and Networks Oy Transmission répétée d'attribution de planification pour réponse d'accès aléatoire
US9577779B2 (en) * 2014-10-22 2017-02-21 Huawei Technologies Co., Ltd. System and method for low peak to average power ratio multiple access communications
US20160255559A1 (en) * 2015-02-26 2016-09-01 General Motors Llc Selecting a radio access technology at a wireless device
RU2696561C1 (ru) * 2016-01-29 2019-08-05 Телефонактиеболагет Лм Эрикссон (Пабл) Скачкообразное изменение частоты для произвольного доступа
CN109788574B (zh) * 2017-11-15 2023-10-24 华为技术有限公司 随机接入的方法、用户设备及网络设备
CN110944392B (zh) * 2018-09-21 2023-12-19 维沃移动通信有限公司 一种信息发送方法、随机接入方法、终端设备和网络侧设备

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1594336A2 (fr) * 2004-05-07 2005-11-09 Samsung Electronics Co., Ltd. Système et procédé de transfert capable de réduire au minimum le retard de service dans un système d'accès de communication sans fil à bande large

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0828754B2 (ja) * 1993-06-30 1996-03-21 日本電気株式会社 フレーム同期方式
JP3432335B2 (ja) 1995-06-27 2003-08-04 株式会社東芝 移動無線通信装置
US5926469A (en) 1996-11-12 1999-07-20 Telefonaktiebolaget L/M Ericssoon (Publ) Channel resource management within a digital mobile communications network
KR100267221B1 (ko) * 1998-02-09 2000-10-16 서평원 이동통신 시스템에서 기지국과 이동 단말기간 데이터 통신방법
EP0938193A1 (fr) * 1998-02-18 1999-08-25 Sony International (Europe) GmbH Structure de l'en-tête pour des systèmes TDD
US6567482B1 (en) * 1999-03-05 2003-05-20 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for efficient synchronization in spread spectrum communications
RU2168278C2 (ru) * 1999-07-16 2001-05-27 Корпорация "Самсунг Электроникс" Способ произвольного доступа абонентов мобильной станции
JP2002300628A (ja) * 2001-04-02 2002-10-11 Matsushita Electric Ind Co Ltd ハンドオーバーの処理方法及びその送受信装置
US6744747B2 (en) * 2001-08-22 2004-06-01 Qualcomm, Incorporated Method & apparatus for W-CDMA handoff searching
AU2003214593A1 (en) * 2002-03-07 2003-09-16 Alvarion Ltd. Hierarchical preamble constructions for ofdma based on complementary sequences
US7633927B2 (en) * 2003-01-31 2009-12-15 Nokia Corporation System and method for extending neighboring cell search window
JP4771648B2 (ja) * 2003-02-28 2011-09-14 京セラ株式会社 携帯電話機
CN1306745C (zh) * 2003-05-30 2007-03-21 电子科技大学 一种基于时间频率同步训练序列的导引方法
WO2006015108A2 (fr) 2004-07-27 2006-02-09 Zte San Diego, Inc. Transmission et reception de signaux de preambule de reference dans des systemes de communication ofdma ou ofdm
KR100856249B1 (ko) * 2004-08-26 2008-09-03 삼성전자주식회사 무선 통신 시스템에서 초기 동작 모드 검출 방법
KR100899749B1 (ko) * 2005-01-13 2009-05-27 삼성전자주식회사 다중 입력 다중 출력 방식을 사용하는 직교 주파수 분할 다중 통신시스템에서 프리앰블 시퀀스 송수신 방법
CN101151832A (zh) * 2005-03-30 2008-03-26 松下电器产业株式会社 通信终端装置、基站装置和接收方法
US8145121B2 (en) * 2005-12-08 2012-03-27 Electronics And Telecommunications Research Institute Wireless communication system counting mobile terminals using MBMS
WO2008038367A1 (fr) * 2006-09-28 2008-04-03 Fujitsu Limited Appareil de communication sans fil
US7792212B2 (en) * 2007-01-05 2010-09-07 Lg Electronics, Inc. Method for setting cyclic shift considering frequency offset

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1594336A2 (fr) * 2004-05-07 2005-11-09 Samsung Electronics Co., Ltd. Système et procédé de transfert capable de réduire au minimum le retard de service dans un système d'accès de communication sans fil à bande large

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NTT DOCOMO ET AL: "Text Proposal for TR 25.912, 13.6 Mobility", 3GPP DRAFT; R2-061703, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Shanghai, China; 20060515, 15 May 2006 (2006-05-15), XP050131565, [retrieved on 2006-05-15] *
See also references of WO2008038367A1 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2706796A3 (fr) * 2012-09-11 2016-11-16 Fujitsu Limited Terminal, circuit de communication and méthode de communication avec transmission d'un signal d'accès aléatoire en cas de perte de synchronisation.
EP3247156A4 (fr) * 2015-02-12 2018-02-21 Huawei Technologies Co., Ltd. Dispositif, système et procédé d'émission de signal
US10555277B2 (en) 2015-02-12 2020-02-04 Huawei Technologies Co., Ltd. Signal transmission apparatus, system, and method
EP3661301A1 (fr) * 2015-02-12 2020-06-03 Huawei Technologies Co., Ltd. Appareil, système et procédé de transmission de signal
US11057867B2 (en) 2015-02-12 2021-07-06 Huawei Technologies Co., Ltd. Signal transmission apparatus, system, and method

Also Published As

Publication number Publication date
EP2704496A1 (fr) 2014-03-05
RU2011113341A (ru) 2012-10-20
KR101036985B1 (ko) 2011-05-25
RU2013113411A (ru) 2014-10-10
US20120188986A1 (en) 2012-07-26
CN101513099A (zh) 2009-08-19
JP4801739B2 (ja) 2011-10-26
RU2532411C1 (ru) 2014-11-10
US8848667B2 (en) 2014-09-30
CA2664754A1 (fr) 2008-04-03
US20090180443A1 (en) 2009-07-16
CA2664754C (fr) 2014-10-07
JPWO2008038367A1 (ja) 2010-01-28
CN101513099B (zh) 2012-07-04
RU2480964C2 (ru) 2013-04-27
RU2483491C2 (ru) 2013-05-27
AU2006348829A1 (en) 2008-04-03
RU2011113343A (ru) 2012-10-20
EP2592883A1 (fr) 2013-05-15
CA2767302A1 (fr) 2008-04-03
CA2767302C (fr) 2012-10-16
RU2011113339A (ru) 2012-10-20
US8194612B2 (en) 2012-06-05
EP2704496B1 (fr) 2016-03-23
RU2483441C2 (ru) 2013-05-27
AU2006348829B8 (en) 2011-06-30
EP2068571B1 (fr) 2014-02-12
EP2592883B1 (fr) 2014-11-26
KR20090053952A (ko) 2009-05-28
EP2068571A4 (fr) 2012-07-04
AU2006348829B2 (en) 2011-03-10
WO2008038367A1 (fr) 2008-04-03

Similar Documents

Publication Publication Date Title
US8194612B2 (en) Wireless communication device
EP3133881B1 (fr) Procédé, appareil et dispositif d'émission et de réception d'un signal de synchronisation
US8406781B2 (en) Determination of user equipment antenna capability
US8825050B2 (en) Random access channel preamble detection
US20070064666A1 (en) Method of allocating resources and method of receiving the allocated resources in a communication system
US8693448B2 (en) Random access procedure
AU2006344626A1 (en) Radio communication system
CN102695226B (zh) 移动站和无线通信系统
JP5088434B2 (ja) 無線通信装置
AU2011202795B2 (en) Wireless communication device
AU2011202793B2 (en) Wireless communication device
AU2011202790B2 (en) Wireless communication device
RU2426278C2 (ru) Устройство беспроводной связи
KR20080043193A (ko) 무선통신 시스템에서 다중 안테나를 통한 임의접근채널메시지의 송수신 방법 및 장치

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20090331

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

RIC1 Information provided on ipc code assigned before grant

Ipc: H04W 84/00 20090101AFI20090518BHEP

DAX Request for extension of the european patent (deleted)
RBV Designated contracting states (corrected)

Designated state(s): DE FR GB IT

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602006040285

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: H04W0084000000

Ipc: H04W0056000000

A4 Supplementary search report drawn up and despatched

Effective date: 20120604

RIC1 Information provided on ipc code assigned before grant

Ipc: H04W 56/00 20090101AFI20120529BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20130523

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20131119

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602006040285

Country of ref document: DE

Effective date: 20140327

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602006040285

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20141113

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602006040285

Country of ref document: DE

Effective date: 20141113

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 12

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230810

Year of fee payment: 18

Ref country code: GB

Payment date: 20230810

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20230808

Year of fee payment: 18

Ref country code: DE

Payment date: 20230802

Year of fee payment: 18